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making room for all conceivable characters within a language, and even accommodating multiple languages
reads like snakeoil… Why not design the algorithm to work on arbitrary blocks of bytes so you don't need to care about „characters“, just like any real-world encryption algorithm?
Yeah, no idea why. Seems like a basic character substitution algorithm using a basic one time pad scheme.
I'm not super deep into cryptography, because it's a whole field unto itself with experts that can make your head spin in seconds. But this "novel" approach (given the description in this article which might be flawed), reads as neither novel nor secure.
I can't access the DOI linked though, so I guess I'll wait for more reliable coverage.